1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config NFS_FS 2 config NFS_FS
3 tristate "NFS client support" 3 tristate "NFS client support"
4 depends on INET && FILE_LOCKING && MUL 4 depends on INET && FILE_LOCKING && MULTIUSER
5 select LOCKD 5 select LOCKD
6 select SUNRPC 6 select SUNRPC
7 select NFS_COMMON 7 select NFS_COMMON
8 select NFS_ACL_SUPPORT if NFS_V3_ACL 8 select NFS_ACL_SUPPORT if NFS_V3_ACL
9 help 9 help
10 Choose Y here if you want to access 10 Choose Y here if you want to access files residing on other
11 computers using Sun's Network File S 11 computers using Sun's Network File System protocol. To compile
12 this file system support as a module 12 this file system support as a module, choose M here: the module
13 will be called nfs. 13 will be called nfs.
14 14
15 To mount file systems exported by NF 15 To mount file systems exported by NFS servers, you also need to
16 install the user space mount.nfs com 16 install the user space mount.nfs command which can be found in
17 the Linux nfs-utils package, availab 17 the Linux nfs-utils package, available from http://linux-nfs.org/.
18 Information about using the mount co 18 Information about using the mount command is available in the
19 mount(8) man page. More detail abou 19 mount(8) man page. More detail about the Linux NFS client
20 implementation is available via the 20 implementation is available via the nfs(5) man page.
21 21
22 Below you can choose which versions 22 Below you can choose which versions of the NFS protocol are
23 available in the kernel to mount NFS 23 available in the kernel to mount NFS servers. Support for NFS
24 version 2 (RFC 1094) is always avail 24 version 2 (RFC 1094) is always available when NFS_FS is selected.
25 25
26 To configure a system which mounts i 26 To configure a system which mounts its root file system via NFS
27 at boot time, say Y here, select "Ke 27 at boot time, say Y here, select "Kernel level IP
28 autoconfiguration" in the NETWORK me 28 autoconfiguration" in the NETWORK menu, and select "Root file
29 system on NFS" below. You cannot co 29 system on NFS" below. You cannot compile this file system as a
30 module in this case. 30 module in this case.
31 31
32 If unsure, say N. 32 If unsure, say N.
33 33
34 config NFS_V2 34 config NFS_V2
35 tristate "NFS client support for NFS v 35 tristate "NFS client support for NFS version 2"
36 depends on NFS_FS 36 depends on NFS_FS
37 default n 37 default n
38 help 38 help
39 This option enables support for vers 39 This option enables support for version 2 of the NFS protocol
40 (RFC 1094) in the kernel's NFS clien 40 (RFC 1094) in the kernel's NFS client.
41 41
42 If unsure, say N. 42 If unsure, say N.
43 43
44 config NFS_V3 44 config NFS_V3
45 tristate "NFS client support for NFS v 45 tristate "NFS client support for NFS version 3"
46 depends on NFS_FS 46 depends on NFS_FS
47 default y 47 default y
48 help 48 help
49 This option enables support for vers 49 This option enables support for version 3 of the NFS protocol
50 (RFC 1813) in the kernel's NFS clien 50 (RFC 1813) in the kernel's NFS client.
51 51
52 If unsure, say Y. 52 If unsure, say Y.
53 53
54 config NFS_V3_ACL 54 config NFS_V3_ACL
55 bool "NFS client support for the NFSv3 55 bool "NFS client support for the NFSv3 ACL protocol extension"
56 depends on NFS_V3 56 depends on NFS_V3
57 help 57 help
58 Some NFS servers support an auxiliar 58 Some NFS servers support an auxiliary NFSv3 ACL protocol that
59 Sun added to Solaris but never becam 59 Sun added to Solaris but never became an official part of the
60 NFS version 3 protocol. This protoc 60 NFS version 3 protocol. This protocol extension allows
61 applications on NFS clients to manip 61 applications on NFS clients to manipulate POSIX Access Control
62 Lists on files residing on NFS serve 62 Lists on files residing on NFS servers. NFS servers enforce
63 ACLs on local files whether this pro 63 ACLs on local files whether this protocol is available or not.
64 64
65 Choose Y here if your NFS server sup 65 Choose Y here if your NFS server supports the Solaris NFSv3 ACL
66 protocol extension and you want your 66 protocol extension and you want your NFS client to allow
67 applications to access and modify AC 67 applications to access and modify ACLs on files on the server.
68 68
69 Most NFS servers don't support the S 69 Most NFS servers don't support the Solaris NFSv3 ACL protocol
70 extension. You can choose N here or 70 extension. You can choose N here or specify the "noacl" mount
71 option to prevent your NFS client fr 71 option to prevent your NFS client from trying to use the NFSv3
72 ACL protocol. 72 ACL protocol.
73 73
74 If unsure, say N. 74 If unsure, say N.
75 75
76 config NFS_V4 76 config NFS_V4
77 tristate "NFS client support for NFS v 77 tristate "NFS client support for NFS version 4"
78 depends on NFS_FS 78 depends on NFS_FS
79 select KEYS 79 select KEYS
80 help 80 help
81 This option enables support for vers 81 This option enables support for version 4 of the NFS protocol
82 (RFC 3530) in the kernel's NFS clien 82 (RFC 3530) in the kernel's NFS client.
83 83
84 To mount NFS servers using NFSv4, yo 84 To mount NFS servers using NFSv4, you also need to install user
85 space programs which can be found in 85 space programs which can be found in the Linux nfs-utils package,
86 available from http://linux-nfs.org/ 86 available from http://linux-nfs.org/.
87 87
88 If unsure, say Y. 88 If unsure, say Y.
89 89
90 config NFS_SWAP 90 config NFS_SWAP
91 bool "Provide swap over NFS support" 91 bool "Provide swap over NFS support"
92 default n 92 default n
93 depends on NFS_FS && SWAP 93 depends on NFS_FS && SWAP
94 select SUNRPC_SWAP 94 select SUNRPC_SWAP
95 help 95 help
96 This option enables swapon to work o 96 This option enables swapon to work on files located on NFS mounts.
97 97
98 config NFS_V4_1 98 config NFS_V4_1
99 bool "NFS client support for NFSv4.1" 99 bool "NFS client support for NFSv4.1"
100 depends on NFS_V4 100 depends on NFS_V4
101 select SUNRPC_BACKCHANNEL 101 select SUNRPC_BACKCHANNEL
102 help 102 help
103 This option enables support for mino 103 This option enables support for minor version 1 of the NFSv4 protocol
104 (RFC 5661) in the kernel's NFS clien 104 (RFC 5661) in the kernel's NFS client.
105 105
106 If unsure, say N. 106 If unsure, say N.
107 107
108 config NFS_V4_2 108 config NFS_V4_2
109 bool "NFS client support for NFSv4.2" 109 bool "NFS client support for NFSv4.2"
110 depends on NFS_V4_1 110 depends on NFS_V4_1
111 help 111 help
112 This option enables support for mino 112 This option enables support for minor version 2 of the NFSv4 protocol
113 in the kernel's NFS client. 113 in the kernel's NFS client.
114 114
115 If unsure, say N. 115 If unsure, say N.
116 116
117 config PNFS_FILE_LAYOUT 117 config PNFS_FILE_LAYOUT
118 tristate 118 tristate
119 depends on NFS_V4_1 119 depends on NFS_V4_1
120 default NFS_V4 120 default NFS_V4
121 121
122 config PNFS_BLOCK 122 config PNFS_BLOCK
123 tristate 123 tristate
124 depends on NFS_V4_1 && BLK_DEV_DM 124 depends on NFS_V4_1 && BLK_DEV_DM
125 default NFS_V4 125 default NFS_V4
126 126
127 config PNFS_FLEXFILE_LAYOUT 127 config PNFS_FLEXFILE_LAYOUT
128 tristate 128 tristate
129 depends on NFS_V4_1 129 depends on NFS_V4_1
130 default NFS_V4 130 default NFS_V4
131 131
132 config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN 132 config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
133 string "NFSv4.1 Implementation ID Doma 133 string "NFSv4.1 Implementation ID Domain"
134 depends on NFS_V4_1 134 depends on NFS_V4_1
135 default "kernel.org" 135 default "kernel.org"
136 help 136 help
137 This option defines the domain porti 137 This option defines the domain portion of the implementation ID that
138 may be sent in the NFS exchange_id o 138 may be sent in the NFS exchange_id operation. The value must be in
139 the format of a DNS domain name and 139 the format of a DNS domain name and should be set to the DNS domain
140 name of the distribution. 140 name of the distribution.
141 If the NFS client is unchanged from 141 If the NFS client is unchanged from the upstream kernel, this
142 option should be set to the default 142 option should be set to the default "kernel.org".
143 143
144 config NFS_V4_1_MIGRATION 144 config NFS_V4_1_MIGRATION
145 bool "NFSv4.1 client support for migra 145 bool "NFSv4.1 client support for migration"
146 depends on NFS_V4_1 146 depends on NFS_V4_1
147 default n 147 default n
148 help 148 help
149 This option makes the NFS client adv 149 This option makes the NFS client advertise to NFSv4.1 servers that
150 it can support NFSv4 migration. 150 it can support NFSv4 migration.
151 151
152 The NFSv4.1 pieces of the Linux NFSv 152 The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
153 still experimental. If you are not 153 still experimental. If you are not an NFSv4 developer, say N here.
154 154
155 config NFS_V4_SECURITY_LABEL 155 config NFS_V4_SECURITY_LABEL
156 bool 156 bool
157 depends on NFS_V4_2 && SECURITY 157 depends on NFS_V4_2 && SECURITY
158 default y 158 default y
159 159
160 config ROOT_NFS 160 config ROOT_NFS
161 bool "Root file system on NFS" 161 bool "Root file system on NFS"
162 depends on NFS_FS=y && IP_PNP 162 depends on NFS_FS=y && IP_PNP
163 help 163 help
164 If you want your system to mount its 164 If you want your system to mount its root file system via NFS,
165 choose Y here. This is common pract 165 choose Y here. This is common practice for managing systems
166 without local permanent storage. Fo 166 without local permanent storage. For details, read
167 <file:Documentation/admin-guide/nfs/ 167 <file:Documentation/admin-guide/nfs/nfsroot.rst>.
168 168
169 Most people say N here. 169 Most people say N here.
170 170
171 config NFS_FSCACHE 171 config NFS_FSCACHE
172 bool "Provide NFS client caching suppo 172 bool "Provide NFS client caching support"
173 depends on NFS_FS=m && NETFS_SUPPORT | 173 depends on NFS_FS=m && NETFS_SUPPORT || NFS_FS=y && NETFS_SUPPORT=y
174 select FSCACHE 174 select FSCACHE
175 help 175 help
176 Say Y here if you want NFS data to b 176 Say Y here if you want NFS data to be cached locally on disc through
177 the general filesystem cache manager 177 the general filesystem cache manager
178 178
179 config NFS_USE_LEGACY_DNS 179 config NFS_USE_LEGACY_DNS
180 bool "Use the legacy NFS DNS resolver" 180 bool "Use the legacy NFS DNS resolver"
181 depends on NFS_V4 181 depends on NFS_V4
182 help 182 help
183 The kernel now provides a method for 183 The kernel now provides a method for translating a host name into an
184 IP address. Select Y here if you wo 184 IP address. Select Y here if you would rather use your own DNS
185 resolver script. 185 resolver script.
186 186
187 If unsure, say N 187 If unsure, say N
188 188
189 config NFS_USE_KERNEL_DNS 189 config NFS_USE_KERNEL_DNS
190 bool 190 bool
191 depends on NFS_V4 && !NFS_USE_LEGACY_D 191 depends on NFS_V4 && !NFS_USE_LEGACY_DNS
192 select DNS_RESOLVER 192 select DNS_RESOLVER
193 default y 193 default y
194 194
195 config NFS_DEBUG 195 config NFS_DEBUG
196 bool 196 bool
197 depends on NFS_FS && SUNRPC_DEBUG 197 depends on NFS_FS && SUNRPC_DEBUG
198 select CRC32 198 select CRC32
199 default y 199 default y
200 200
201 config NFS_DISABLE_UDP_SUPPORT 201 config NFS_DISABLE_UDP_SUPPORT
202 bool "NFS: Disable NFS UDP protocol sup 202 bool "NFS: Disable NFS UDP protocol support"
203 depends on NFS_FS 203 depends on NFS_FS
204 default y 204 default y
205 help 205 help
206 Choose Y here to disable the use of N 206 Choose Y here to disable the use of NFS over UDP. NFS over UDP
207 on modern networks (1Gb+) can lead to 207 on modern networks (1Gb+) can lead to data corruption caused by
208 fragmentation during high loads. 208 fragmentation during high loads.
209 209
210 config NFS_V4_2_READ_PLUS 210 config NFS_V4_2_READ_PLUS
211 bool "NFS: Enable support for the NFSv 211 bool "NFS: Enable support for the NFSv4.2 READ_PLUS operation"
212 depends on NFS_V4_2 212 depends on NFS_V4_2
213 default y 213 default y
214 help 214 help
215 Choose Y here to enable use of the NF 215 Choose Y here to enable use of the NFS v4.2 READ_PLUS operation.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.